Substitution Property of Equality

Pronunciation: /ˈsʌb stɪˌtut ʃən ˈprɒp ər ti ʌv ɪˈkwɒl ɪ ti/ ?

The substitution property of equality that, if a = b, then b can be substituted for a in any equation without changing the truth value of the equation. For example:

  • Let a = b.
  • Let d = a + 2.
  • Then d = b + 2.


  1. substitution. Encyclopedia Britannica. (Accessed: 2009-03-12).

Cite this article as:

Substitution Property of Equality. 2008-12-24. All Math Words Encyclopedia. Life is a Story Problem LLC.


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Revision History

2008-12-24: Added concept of 'truth value' of an equation (McAdams, David.)
2008-07-01: Initial version (McAdams, David.)

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